$ git clone -n https://src.fedoraproject.org/rpms/mesa-libGLw.git /var/lib/mock/f40-build-2200577-51785/root/chroot_tmpdir/scmroot/mesa-libGLw
Cloning into '/var/lib/mock/f40-build-2200577-51785/root/chroot_tmpdir/scmroot/mesa-libGLw'...
$ git fetch origin b31ffa3c97e7f467002d74e04fa4d35d39bd6479:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mesa-libGLw
 * [new ref]         b31ffa3c97e7f467002d74e04fa4d35d39bd6479 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b31ffa3 SPDX Migration